Transfer of technetium from paddy soil to rice seedling

Tracer experiments on the chemical transformation of technetium in paddy so il and the transfer to rice seedlings have been carried out using Tc-95m as a tracer. Two common Japanese soils, Andosol and Gray lowland soil were us ed in the soil incubation experiments. The chemical form of soluble Te in s oil water was a mixture of Tc-organic matter complex, Tc-iron complex and p ertechnetate. An uptake experiment with rice seedlings using nutrient solut ion showed that the Tc-organic matter complex was less available than perte chnetate or the Tc-iron complex. These chemical forms of Tc were also obser ved in the root bleeding sap of rice seedlings when introduced to the nutri ent solution containing soluble Tc. These results suggested that the transf er of technetium from soil to rice would depend on the chemical form of Tc and they would transport from the root to the leaf without chemical transfo rmation.